The Yokomo YOKPG6428 pinion is built for R/C pinion gear systems and common drivetrain assemblies. Its 64 pitch and 28 teeth specify the tooth spacing and count that must match a spur gear of the same pitch.
Keep this part as a straightforward swap or use it when tuning gear ratios; altering the pinion tooth count shifts the overall ratio and affects acceleration versus top speed in your model. It is not suitable for real vehicle application.
Installation advice: slide the pinion onto the motor shaft, align it for even tooth contact, tighten the set screw(s) to secure the part without crushing the shaft, and check axial alignment. Manually spin the drivetrain after fitting to ensure there is no binding.
Practical tuning hints: always match pitch between pinion and spur, check the contact patch under light load, and run trial tests after each pinion change to verify desired performance in your setup.
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